You need to configure your new router to act as an access point. You will most likely have plug the cable that comes into your room into 1 of the LAN ports on the new router (but not the WAN port)
Then set the new router so it does not assign IP addresses to your devices. (disable DHCP server) You will also need to assign a static IP address in the 192.168.1.xxx range to the new wireless router.
Some routers simply have a tick box to set it into "access point mode" or something similar.
Look in the directions of your new router for something about "access point" or google your make and model number with some thing like "Configure as Access Point".
Or post some more info about the devices you have, like the make and model # here.
This page gives some quick basics. http://www.home-network-help.com/wir...ess-point.html